Good point, but disguises can be very useful. I am completely in agreement that they won't be what I'm personally use to from TF2.
Ohhhh I wonder if there is a french voice pack

I was never really on your side.
What? The Operative can disguise as a fallen enemy. Sure, it's not like you can go invisible, and using the disguise to fool enemies will require a little finesse, but it's silly to say the Operative is not stealthy at all. Wedgwood said that the Operative is the "stealthy guy who sneaks behind enemy lines".
It's good that you're trying to prepare people for the Operative being neither a Third Echelon agent nor a TF2 spy, and not relying entirely on going unnoticed, but let's not get carried away. Operative is the sneakiest role. It's just also equipped to engage in traditional FPS combat, and will be required to employ both shooter skills and infiltration skills as circumstances change.
Light operative is likely the easiest class to be stealthy with. Yes they are is no cloak or anything that we know of yet. However the speed and ability to get places no one else can supposed to give us the edge. As I have said in other treads hit and run tactics is the key. Your solider and medic have the enemy team under fire and then the faster players will flank and finish.
Operatives creed = 4 F's
Find, fix, flank, and finish.
wow, this went to bashing on Operatives very quickly. Operatives are Scout/Saboteurs both of which are most efficient when stealthy. Of course the soldier engineer and medic can be stealthy too, but what benefit does that give? A sneaky soldier will blow someone up from behind, immediately get spotted and killed. A sneaky engineer will throw a turret in some odd spot where, yes it will get decent kills, however and enemy operative will come, kill you, and hack the turret. A sneaky medic? you better be with other sneaky people, or else your whole role is thrown out of whack with nobody to heal. a sneaky Operative? finds you flanking routes, opens shortcuts, gathers intel, scouts enemies, and while the medics engineers and soldiers are on the frontlines, the operative is softening up the opposition while you get to pick them off. Operatives can be played non-stealthily, I just think i'd play it better stealthily.
I really couldn't have put it better myself. I think that teamwork is going to the deciding factor. Two operatives working together is better than one but that could be said of any class.